/* An instance of this class represents an atomic expression, meaning one
** involving no operators.
**
** Author: R. McCloskey
** Date: Feb. 2022
*/
public class ExprTreeAtomic extends ExprTree {

   // instance variable
   // -----------------

   private final int val;   // the value of this expression


   // constructor
   // -----------

   /* Initializes this atomic expression to have the given value.
   */
   public ExprTreeAtomic(int number) { 
      super();
      val = number;
   }

   // observer
   // --------

   @Override
   public int valueOf() { return val; }

   /* Note that the expression-string describing an atomic expression
   ** is the same, regardless of the "print mode".
   */
   @Override
   public String toString(int mode) { return "" + val; }

}